[3.12] gh-109582: test_fork_signal_handling should wait for event (GH-109605) #109695
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Sometimes the child_handled event was missing because either
the child quits before it gets a chance to handle the signal,
or the parent asserts before the event notification is
delivered via IPC. Synchronize explicitly to avoid this.
(cherry picked from commit 608c1f3)
Co-authored-by: Davide Rizzo [email protected]